function like(btn, entityType, entityId, entityUserid,postId) {
    $.post(
      CONTEXT_PATH + "/like",
        {"entityType":entityType,"entityId":entityId,"entityUserid":entityUserid,"postId":postId},
        function (data) {
          data = $.parseJSON(data);
          if(data.code == 0){
              $(btn).children("i").text(data.likeCount);
              $(btn).children("b").text(data.likeStatus==1?"已赞":"赞");
          }else {
            alert(data.msg);
          }
        }
    );
}